Shrimad Bhagavad Gita As It Is -Shri Shrimad A.C Bhaktivedanta Swami Prabhupada
The Opulence of the Absolute
Chapter 10: Verse-8
aham sarvasya prabhavo mattah sarvam pravartate
I am the source of all spiritual and material worlds. Everything emanates from Me. The wise who perfectly know this engage in My devotional service and worship Me with all their hearts.
PURPORTA learned scholar who has studied the Vedas perfectly and has information from authorities like Lord Caitanya and who knows how to apply these teachings can understand that krsna is the origin of everything in both the material and spiritual worlds, and because he knows this perfectly he becomes firmly fixed in the devotional service of the Supreme Lord.
He can never be deviated by any amount of nonsensical commentaries or by fools. All Vedic literature agrees that krsna is the source of Brahmä, Siva and all other demigods. In the Atharva Veda Gopäla-täpani  it is said, yo brahmänam vidadhäti pürvam yo vai vedäms ca gäpayati sma krsnah: “It was krsna who in the beginning instructed Brahmä in Vedic knowledge and who disseminated Vedic knowledge in the past.” Then again the Näräyana Upanisad 1 says, atha puruso ha vai näräyano ’kämayata prajäh srjeyeti: “Then the Supreme Personality Näräyana desired to create living entities.” The Upanisad continues, näräyanäd brahmä jäyate, näräyanäd prajäpatih prajäyate, näräyanäd indro jäyate, näräyanäd astau vasavo jäyante, näräyanäd ekädasa rudrä jäyante, näräyanäd dvädasädityäh: “From Näräyana, Brahmä is born, and from Näräyana the patriarchs are also born. From Näräyana, Indra is born, from Näräyana the eight Vasus are born, from Näräyana the eleven Rudras are born, from Näräyana the twelve Ädityas are born.” This Näräyana is an expansion of Krsna.